A 23-year-old man has been arrested on suspicion of rape in Parliament.
A Metropolitan Police spokesman said the alleged attack occurred in the early hours of Friday morning but stressed the suspect was not an MP.
"Detectives from the sexual offences, exploitation and child abuse command are investigating an allegation of rape at the Houses of Parliament in the early hours of Friday, 14 October," the spokesman said.
"A 23-year-old man was arrested that same day on suspicion of rape. He has been bailed pending further inquires to a date in mid-January 2017."
A House of Commons spokesman said: "We are aware of an incident on the parliamentary estate which is being investigated by the Metropolitan Police Service.
"Parliament is working closely with the police on their investigation and we cannot comment further while this is ongoing."
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